抄録
Pyrido[2, 3-d]pyrimidines were obtained by treatment of 6-allylaminouracils with PdCl2 at 60 °C, under which conditions the yields of the products were improved to a considerable extent as compared with our previously reported reaction. Pyrrolo[2, 3-d]pyrimidines were prepared under the above conditions from 6-(N-allyl-N-methylamino)uracils which were substituted with a methyl group at 6-NH of uracil. In addition, pyrido- and pyrrolo[2, 3-d]pyrimidine nucleosides were prepared from 6-(substituted allyl- or N-allyl-N-methylamino)uridines by adaptation of the above method. That is, the presence or absence of a substituent on the 6-amino group influences the size of ring formed. We proposed plausible pathways to explain why products having different ring sizes were formed.
